[rtems-libbsd commit] regulator: Import from FreeBSD.

Christian Mauderer christianm at rtems.org
Wed Apr 15 15:13:21 UTC 2020


Module:    rtems-libbsd
Branch:    5-freebsd-12
Commit:    404ad60f5f389d337c616699bc060a3c0742f243
Changeset: http://git.rtems.org/rtems-libbsd/commit/?id=404ad60f5f389d337c616699bc060a3c0742f243

Author:    Christian Mauderer <christian.mauderer at embedded-brains.de>
Date:      Thu Apr  2 18:04:17 2020 +0200

regulator: Import from FreeBSD.

Update #3869.

---

 freebsd/sys/dev/extres/regulator/regulator.c       | 1321 ++++++++++++++++++++
 freebsd/sys/dev/extres/regulator/regulator.h       |  156 +++
 freebsd/sys/dev/extres/regulator/regulator_bus.c   |   89 ++
 freebsd/sys/dev/extres/regulator/regulator_fixed.c |  502 ++++++++
 freebsd/sys/dev/extres/regulator/regulator_fixed.h |   44 +
 freebsd/sys/dev/gpio/gpioregulator.c               |  350 ++++++
 6 files changed, 2462 insertions(+)

diff --git a/freebsd/sys/dev/extres/regulator/regulator.c b/freebsd/sys/dev/extres/regulator/regulator.c
new file mode 100644
index 0000000..4ad6e94
--- /dev/null
+++ b/freebsd/sys/dev/extres/regulator/regulator.c
@@ -0,0 +1,1321 @@
+#include <machine/rtems-bsd-kernel-space.h>
+
+/*-
+ * Copyright 2016 Michal Meloun <mmel at FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <rtems/bsd/local/opt_platform.h>
+#include <sys/param.h>
+#include <sys/conf.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/queue.h>
+#include <sys/kobj.h>
+#include <sys/malloc.h>
+#include <sys/mutex.h>
+#include <sys/limits.h>
+#include <sys/lock.h>
+#include <sys/sysctl.h>
+#include <sys/systm.h>
+#include <sys/sx.h>
+
+#ifdef FDT
+#include <dev/fdt/fdt_common.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+#endif
+#include <dev/extres/regulator/regulator.h>
+
+#include <rtems/bsd/local/regdev_if.h>
+
+SYSCTL_NODE(_hw, OID_AUTO, regulator, CTLFLAG_RD, NULL, "Regulators");
+
+MALLOC_DEFINE(M_REGULATOR, "regulator", "Regulator framework");
+
+#define	DIV_ROUND_UP(n,d) howmany(n, d)
+
+/* Forward declarations. */
+struct regulator;
+struct regnode;
+
+typedef TAILQ_HEAD(regnode_list, regnode) regnode_list_t;
+typedef TAILQ_HEAD(regulator_list, regulator) regulator_list_t;
+
+/* Default regulator methods. */
+static int regnode_method_init(struct regnode *regnode);
+static int regnode_method_enable(struct regnode *regnode, bool enable,
+    int *udelay);
+static int regnode_method_status(struct regnode *regnode, int *status);
+static int regnode_method_set_voltage(struct regnode *regnode, int min_uvolt,
+    int max_uvolt, int *udelay);
+static int regnode_method_get_voltage(struct regnode *regnode, int *uvolt);
+static void regulator_constraint(void *dummy);
+static void regulator_shutdown(void *dummy);
+
+/*
+ * Regulator controller methods.
+ */
+static regnode_method_t regnode_methods[] = {
+	REGNODEMETHOD(regnode_init,		regnode_method_init),
+	REGNODEMETHOD(regnode_enable,		regnode_method_enable),
+	REGNODEMETHOD(regnode_status,		regnode_method_status),
+	REGNODEMETHOD(regnode_set_voltage,	regnode_method_set_voltage),
+	REGNODEMETHOD(regnode_get_voltage,	regnode_method_get_voltage),
+	REGNODEMETHOD(regnode_check_voltage,	regnode_method_check_voltage),
+
+	REGNODEMETHOD_END
+};
+DEFINE_CLASS_0(regnode, regnode_class, regnode_methods, 0);
+
+/*
+ * Regulator node - basic element for modelling SOC and bard power supply
+ * chains. Its contains producer data.
+ */
+struct regnode {
+	KOBJ_FIELDS;
+
+	TAILQ_ENTRY(regnode)	reglist_link;	/* Global list entry */
+	regulator_list_t	consumers_list;	/* Consumers list */
+
+	/* Cache for already resolved names */
+	struct regnode		*parent;	/* Resolved parent */
+
+	/* Details of this device. */
+	const char		*name;		/* Globally unique name */
+	const char		*parent_name;	/* Parent name */
+
+	device_t		pdev;		/* Producer device_t */
+	void			*softc;		/* Producer softc */
+	intptr_t		id;		/* Per producer unique id */
+#ifdef FDT
+	 phandle_t 		ofw_node;	/* OFW node of regulator */
+#endif
+	int			flags;		/* REGULATOR_FLAGS_ */
+	struct sx		lock;		/* Lock for this regulator */
+	int			ref_cnt;	/* Reference counter */
+	int			enable_cnt;	/* Enabled counter */
+
+	struct regnode_std_param std_param;	/* Standard parameters */
+
+	struct sysctl_ctx_list	sysctl_ctx;
+};
+
+/*
+ * Per consumer data, information about how a consumer is using a regulator
+ * node.
+ * A pointer to this structure is used as a handle in the consumer interface.
+ */
+struct regulator {
+	device_t		cdev;		/* Consumer device */
+	struct regnode		*regnode;
+	TAILQ_ENTRY(regulator)	link;		/* Consumers list entry */
+
+	int			enable_cnt;
+	int 			min_uvolt;	/* Requested uvolt range */
+	int 			max_uvolt;
+};
+
+/*
+ * Regulator names must be system wide unique.
+ */
+static regnode_list_t regnode_list = TAILQ_HEAD_INITIALIZER(regnode_list);
+
+static struct sx		regnode_topo_lock;
+SX_SYSINIT(regulator_topology, &regnode_topo_lock, "Regulator topology lock");
+
+#define REG_TOPO_SLOCK()	sx_slock(&regnode_topo_lock)
+#define REG_TOPO_XLOCK()	sx_xlock(&regnode_topo_lock)
+#define REG_TOPO_UNLOCK()	sx_unlock(&regnode_topo_lock)
+#define REG_TOPO_ASSERT()	sx_assert(&regnode_topo_lock, SA_LOCKED)
+#define REG_TOPO_XASSERT() 	sx_assert(&regnode_topo_lock, SA_XLOCKED)
+
+#define REGNODE_SLOCK(_sc)	sx_slock(&((_sc)->lock))
+#define REGNODE_XLOCK(_sc)	sx_xlock(&((_sc)->lock))
+#define REGNODE_UNLOCK(_sc)	sx_unlock(&((_sc)->lock))
+
+SYSINIT(regulator_constraint, SI_SUB_LAST, SI_ORDER_ANY, regulator_constraint,
+    NULL);
+SYSINIT(regulator_shutdown, SI_SUB_LAST, SI_ORDER_ANY, regulator_shutdown,
+    NULL);
+
+static void
+regulator_constraint(void *dummy)
+{
+	struct regnode *entry;
+	int rv;
+
+	REG_TOPO_SLOCK();
+	TAILQ_FOREACH(entry, &regnode_list, reglist_link) {
+		rv = regnode_set_constraint(entry);
+		if (rv != 0 && bootverbose)
+			printf("regulator: setting constraint on %s failed (%d)\n",
+			    entry->name, rv);
+	}
+	REG_TOPO_UNLOCK();
+}
+
+/*
+ * Disable unused regulator
+ * We run this function at SI_SUB_LAST which mean that every driver that needs
+ * regulator should have already enable them.
+ * All the remaining regulators should be those left enabled by the bootloader
+ * or enable by default by the PMIC.
+ */
+static void
+regulator_shutdown(void *dummy)
+{
+	struct regnode *entry;
+	int status, ret;
+	int disable = 1;
+
+	TUNABLE_INT_FETCH("hw.regulator.disable_unused", &disable);
+	if (!disable)
+		return;
+	REG_TOPO_SLOCK();
+
+	if (bootverbose)
+		printf("regulator: shutting down unused regulators\n");
+	TAILQ_FOREACH(entry, &regnode_list, reglist_link) {
+		if (!entry->std_param.always_on) {
+			ret = regnode_status(entry, &status);
+			if (ret == 0 && status == REGULATOR_STATUS_ENABLED) {
+				if (bootverbose)
+					printf("regulator: shutting down %s... ",
+					    entry->name);
+				ret = regnode_stop(entry, 0);
+				if (bootverbose) {
+					/*
+					 * Call out busy in particular, here,
+					 * because it's not unexpected to fail
+					 * shutdown if the regulator is simply
+					 * in-use.
+					 */
+					if (ret == EBUSY)
+						printf("busy\n");
+					else if (ret != 0)
+						printf("error (%d)\n", ret);
+					else
+						printf("ok\n");
+				}
+			}
+		}
+	}
+	REG_TOPO_UNLOCK();
+}
+
+/*
+ * sysctl handler
+ */
+static int
+regnode_uvolt_sysctl(SYSCTL_HANDLER_ARGS)
+{
+	struct regnode *regnode = arg1;
+	int rv, uvolt;
+
+	if (regnode->std_param.min_uvolt == regnode->std_param.max_uvolt) {
+		uvolt = regnode->std_param.min_uvolt;
+	} else {
+		REG_TOPO_SLOCK();
+		if ((rv = regnode_get_voltage(regnode, &uvolt)) != 0) {
+			REG_TOPO_UNLOCK();
+			return (rv);
+		}
+		REG_TOPO_UNLOCK();
+	}
+
+	return sysctl_handle_int(oidp, &uvolt, sizeof(uvolt), req);
+}
+
+/* ----------------------------------------------------------------------------
+ *
+ * Default regulator methods for base class.
+ *
+ */
+static int
+regnode_method_init(struct regnode *regnode)
+{
+
+	return (0);
+}
+
+static int
+regnode_method_enable(struct regnode *regnode, bool enable, int *udelay)
+{
+
+	if (!enable)
+		return (ENXIO);
+
+	*udelay = 0;
+	return (0);
+}
+
+static int
+regnode_method_status(struct regnode *regnode, int *status)
+{
+	*status = REGULATOR_STATUS_ENABLED;
+	return (0);
+}
+
+static int
+regnode_method_set_voltage(struct regnode *regnode, int min_uvolt, int max_uvolt,
+    int *udelay)
+{
+
+	if ((min_uvolt > regnode->std_param.max_uvolt) ||
+	    (max_uvolt < regnode->std_param.min_uvolt))
+		return (ERANGE);
+	*udelay = 0;
+	return (0);
+}
+
+static int
+regnode_method_get_voltage(struct regnode *regnode, int *uvolt)
+{
+
+	return (regnode->std_param.min_uvolt +
+	    (regnode->std_param.max_uvolt - regnode->std_param.min_uvolt) / 2);
+}
+
+int
+regnode_method_check_voltage(struct regnode *regnode, int uvolt)
+{
+
+	if ((uvolt > regnode->std_param.max_uvolt) ||
+	    (uvolt < regnode->std_param.min_uvolt))
+		return (ERANGE);
+	return (0);
+}
+
+/* ----------------------------------------------------------------------------
+ *
+ * Internal functions.
+ *
+ */
+
+static struct regnode *
+regnode_find_by_name(const char *name)
+{
+	struct regnode *entry;
+
+	REG_TOPO_ASSERT();
+
+	TAILQ_FOREACH(entry, &regnode_list, reglist_link) {
+		if (strcmp(entry->name, name) == 0)
+			return (entry);
+	}
+	return (NULL);
+}
+
+static struct regnode *
+regnode_find_by_id(device_t dev, intptr_t id)
+{
+	struct regnode *entry;
+
+	REG_TOPO_ASSERT();
+
+	TAILQ_FOREACH(entry, &regnode_list, reglist_link) {
+		if ((entry->pdev == dev) && (entry->id ==  id))
+			return (entry);
+	}
+
+	return (NULL);
+}
+
+/*
+ * Create and initialize regulator object, but do not register it.
+ */
+struct regnode *
+regnode_create(device_t pdev, regnode_class_t regnode_class,
+    struct regnode_init_def *def)
+{
+	struct regnode *regnode;
+	struct sysctl_oid *regnode_oid;
+
+	KASSERT(def->name != NULL, ("regulator name is NULL"));
+	KASSERT(def->name[0] != '\0', ("regulator name is empty"));
+
+	REG_TOPO_SLOCK();
+	if (regnode_find_by_name(def->name) != NULL)
+		panic("Duplicated regulator registration: %s\n", def->name);
+	REG_TOPO_UNLOCK();
+
+	/* Create object and initialize it. */
+	regnode = malloc(sizeof(struct regnode), M_REGULATOR,
+	    M_WAITOK | M_ZERO);
+	kobj_init((kobj_t)regnode, (kobj_class_t)regnode_class);
+	sx_init(&regnode->lock, "Regulator node lock");
+
+	/* Allocate softc if required. */
+	if (regnode_class->size > 0) {
+		regnode->softc = malloc(regnode_class->size, M_REGULATOR,
+		    M_WAITOK | M_ZERO);
+	}
+
+
+	/* Copy all strings unless they're flagged as static. */
+	if (def->flags & REGULATOR_FLAGS_STATIC) {
+		regnode->name = def->name;
+		regnode->parent_name = def->parent_name;
+	} else {
+		regnode->name = strdup(def->name, M_REGULATOR);
+		if (def->parent_name != NULL)
+			regnode->parent_name = strdup(def->parent_name,
+			    M_REGULATOR);
+	}
+
+	/* Rest of init. */
+	TAILQ_INIT(&regnode->consumers_list);
+	regnode->id = def->id;
+	regnode->pdev = pdev;
+	regnode->flags = def->flags;
+	regnode->parent = NULL;
+	regnode->std_param = def->std_param;
+#ifdef FDT
+	regnode->ofw_node = def->ofw_node;
+#endif
+
+	sysctl_ctx_init(&regnode->sysctl_ctx);
+	regnode_oid = SYSCTL_ADD_NODE(&regnode->sysctl_ctx,
+	    SYSCTL_STATIC_CHILDREN(_hw_regulator),
+	    OID_AUTO, regnode->name,
+	    CTLFLAG_RD, 0, "A regulator node");
+
+	SYSCTL_ADD_INT(&regnode->sysctl_ctx,
+	    SYSCTL_CHILDREN(regnode_oid),
+	    OID_AUTO, "min_uvolt",
+	    CTLFLAG_RD, &regnode->std_param.min_uvolt, 0,
+	    "Minimal voltage (in uV)");
+	SYSCTL_ADD_INT(&regnode->sysctl_ctx,
+	    SYSCTL_CHILDREN(regnode_oid),
+	    OID_AUTO, "max_uvolt",
+	    CTLFLAG_RD, &regnode->std_param.max_uvolt, 0,
+	    "Maximal voltage (in uV)");
+	SYSCTL_ADD_INT(&regnode->sysctl_ctx,
+	    SYSCTL_CHILDREN(regnode_oid),
+	    OID_AUTO, "min_uamp",
+	    CTLFLAG_RD, &regnode->std_param.min_uamp, 0,
+	    "Minimal amperage (in uA)");
+	SYSCTL_ADD_INT(&regnode->sysctl_ctx,
+	    SYSCTL_CHILDREN(regnode_oid),
+	    OID_AUTO, "max_uamp",
+	    CTLFLAG_RD, &regnode->std_param.max_uamp, 0,
+	    "Maximal amperage (in uA)");
+	SYSCTL_ADD_INT(&regnode->sysctl_ctx,
+	    SYSCTL_CHILDREN(regnode_oid),
+	    OID_AUTO, "ramp_delay",
+	    CTLFLAG_RD, &regnode->std_param.ramp_delay, 0,
+	    "Ramp delay (in uV/us)");
+	SYSCTL_ADD_INT(&regnode->sysctl_ctx,
+	    SYSCTL_CHILDREN(regnode_oid),
+	    OID_AUTO, "enable_delay",
+	    CTLFLAG_RD, &regnode->std_param.enable_delay, 0,
+	    "Enable delay (in us)");
+	SYSCTL_ADD_INT(&regnode->sysctl_ctx,
+	    SYSCTL_CHILDREN(regnode_oid),
+	    OID_AUTO, "enable_cnt",
+	    CTLFLAG_RD, &regnode->enable_cnt, 0,
+	    "The regulator enable counter");
+	SYSCTL_ADD_U8(&regnode->sysctl_ctx,
+	    SYSCTL_CHILDREN(regnode_oid),
+	    OID_AUTO, "boot_on",
+	    CTLFLAG_RD, (uint8_t *) &regnode->std_param.boot_on, 0,
+	    "Is enabled on boot");
+	SYSCTL_ADD_U8(&regnode->sysctl_ctx,
+	    SYSCTL_CHILDREN(regnode_oid),
+	    OID_AUTO, "always_on",
+	    CTLFLAG_RD, (uint8_t *)&regnode->std_param.always_on, 0,
+	    "Is always enabled");
+
+	SYSCTL_ADD_PROC(&regnode->sysctl_ctx,
+	    SYSCTL_CHILDREN(regnode_oid),
+	    OID_AUTO, "uvolt",
+	    CTLTYPE_INT | CTLFLAG_RD,
+	    regnode, 0, regnode_uvolt_sysctl,
+	    "I",
+	    "Current voltage (in uV)");
+
+	return (regnode);
+}
+
+/* Register regulator object. */
+struct regnode *
+regnode_register(struct regnode *regnode)
+{
+	int rv;
+
+#ifdef FDT
+	if (regnode->ofw_node <= 0)
+		regnode->ofw_node = ofw_bus_get_node(regnode->pdev);
+	if (regnode->ofw_node <= 0)
+		return (NULL);
+#endif
+
+	rv = REGNODE_INIT(regnode);
+	if (rv != 0) {
+		printf("REGNODE_INIT failed: %d\n", rv);
+		return (NULL);
+	}
+
+	REG_TOPO_XLOCK();
+	TAILQ_INSERT_TAIL(&regnode_list, regnode, reglist_link);
+	REG_TOPO_UNLOCK();
+#ifdef FDT
+	OF_device_register_xref(OF_xref_from_node(regnode->ofw_node),
+	    regnode->pdev);
+#endif
+	return (regnode);
+}
+
+static int
+regnode_resolve_parent(struct regnode *regnode)
+{
+
+	/* All ready resolved or no parent? */
+	if ((regnode->parent != NULL) ||
+	    (regnode->parent_name == NULL))
+		return (0);
+
+	regnode->parent = regnode_find_by_name(regnode->parent_name);
+	if (regnode->parent == NULL)
+		return (ENODEV);
+	return (0);
+}
+
+static void
+regnode_delay(int usec)
+{
+	int ticks;
+
+	if (usec == 0)
+		return;
+	ticks = (usec * hz + 999999) / 1000000;
+
+	if (cold || ticks < 2)
+		DELAY(usec);
+	else
+		pause("REGULATOR", ticks);
+}
+
+/* --------------------------------------------------------------------------
+ *
+ * Regulator providers interface
+ *
+ */
+
+const char *
+regnode_get_name(struct regnode *regnode)
+{
+
+	return (regnode->name);
+}
+
+const char *
+regnode_get_parent_name(struct regnode *regnode)
+{
+
+	return (regnode->parent_name);
+}
+
+int
+regnode_get_flags(struct regnode *regnode)
+{
+
+	return (regnode->flags);
+}
+
+void *
+regnode_get_softc(struct regnode *regnode)
+{
+
+	return (regnode->softc);
+}
+
+device_t
+regnode_get_device(struct regnode *regnode)
+{
+
+	return (regnode->pdev);
+}
+
+struct regnode_std_param *regnode_get_stdparam(struct regnode *regnode)
+{
+
+	return (&regnode->std_param);
+}
+
+void regnode_topo_unlock(void)
+{
+
+	REG_TOPO_UNLOCK();
+}
+
+void regnode_topo_xlock(void)
+{
+
+	REG_TOPO_XLOCK();
+}
+
+void regnode_topo_slock(void)
+{
+
+	REG_TOPO_SLOCK();
+}
+
+
+/* --------------------------------------------------------------------------
+ *
+ * Real consumers executive
+ *
+ */
+struct regnode *
+regnode_get_parent(struct regnode *regnode)
+{
+	int rv;
+
+	REG_TOPO_ASSERT();
+
+	rv = regnode_resolve_parent(regnode);
+	if (rv != 0)
+		return (NULL);
+
+	return (regnode->parent);
+}
+
+/*
+ * Enable regulator.
+ */
+int
+regnode_enable(struct regnode *regnode)
+{
+	int udelay;
+	int rv;
+
+	REG_TOPO_ASSERT();
+
+	/* Enable regulator for each node in chain, starting from source. */
+	rv = regnode_resolve_parent(regnode);
+	if (rv != 0)
+		return (rv);
+	if (regnode->parent != NULL) {
+		rv = regnode_enable(regnode->parent);
+		if (rv != 0)
+			return (rv);
+	}
+
+	/* Handle this node. */
+	REGNODE_XLOCK(regnode);
+	if (regnode->enable_cnt == 0) {
+		rv = REGNODE_ENABLE(regnode, true, &udelay);
+		if (rv != 0) {
+			REGNODE_UNLOCK(regnode);
+			return (rv);
+		}
+		regnode_delay(udelay);
+	}
+	regnode->enable_cnt++;
+	REGNODE_UNLOCK(regnode);
+	return (0);
+}
+
+/*
+ * Disable regulator.
+ */
+int
+regnode_disable(struct regnode *regnode)
+{
+	int udelay;
+	int rv;
+
+	REG_TOPO_ASSERT();
+	rv = 0;
+
+	REGNODE_XLOCK(regnode);
+	/* Disable regulator for each node in chain, starting from consumer. */
+	if (regnode->enable_cnt == 1 &&
+	    (regnode->flags & REGULATOR_FLAGS_NOT_DISABLE) == 0 &&
+	    !regnode->std_param.always_on) {
+		rv = REGNODE_ENABLE(regnode, false, &udelay);
+		if (rv != 0) {
+			REGNODE_UNLOCK(regnode);
+			return (rv);
+		}
+		regnode_delay(udelay);
+	}
+	regnode->enable_cnt--;
+	REGNODE_UNLOCK(regnode);
+
+	rv = regnode_resolve_parent(regnode);
+	if (rv != 0)
+		return (rv);
+	if (regnode->parent != NULL)
+		rv = regnode_disable(regnode->parent);
+	return (rv);
+}
+
+/*
+ * Stop regulator.
+ */
+int
+regnode_stop(struct regnode *regnode, int depth)
+{
+	int udelay;
+	int rv;
+
+	REG_TOPO_ASSERT();
+	rv = 0;
+
+	REGNODE_XLOCK(regnode);
+	/* The first node must not be enabled. */
+	if ((regnode->enable_cnt != 0) && (depth == 0)) {
+		REGNODE_UNLOCK(regnode);
+		return (EBUSY);
+	}
+	/* Disable regulator for each node in chain, starting from consumer */
+	if ((regnode->enable_cnt == 0) &&
+	    ((regnode->flags & REGULATOR_FLAGS_NOT_DISABLE) == 0)) {
+		rv = REGNODE_STOP(regnode, &udelay);
+		if (rv != 0) {
+			REGNODE_UNLOCK(regnode);
+			return (rv);
+		}
+		regnode_delay(udelay);
+	}
+	REGNODE_UNLOCK(regnode);
+
+	rv = regnode_resolve_parent(regnode);
+	if (rv != 0)
+		return (rv);
+	if (regnode->parent != NULL && regnode->parent->enable_cnt == 0)
+		rv = regnode_stop(regnode->parent, depth + 1);
+	return (rv);
+}
+
+/*
+ * Get regulator status. (REGULATOR_STATUS_*)
+ */
+int
+regnode_status(struct regnode *regnode, int *status)
+{
+	int rv;
+
+	REG_TOPO_ASSERT();
+
+	REGNODE_XLOCK(regnode);
+	rv = REGNODE_STATUS(regnode, status);
+	REGNODE_UNLOCK(regnode);
+	return (rv);
+}
+
+/*
+ * Get actual regulator voltage.
+ */
+int
+regnode_get_voltage(struct regnode *regnode, int *uvolt)
+{
+	int rv;
+
+	REG_TOPO_ASSERT();
+
+	REGNODE_XLOCK(regnode);
+	rv = REGNODE_GET_VOLTAGE(regnode, uvolt);
+	REGNODE_UNLOCK(regnode);
+
+	/* Pass call into parent, if regulator is in bypass mode. */
+	if (rv == ENOENT) {
+		rv = regnode_resolve_parent(regnode);
+		if (rv != 0)
+			return (rv);
+		if (regnode->parent != NULL)
+			rv = regnode_get_voltage(regnode->parent, uvolt);
+
+	}
+	return (rv);
+}
+
+/*
+ * Set regulator voltage.
+ */
+int
+regnode_set_voltage(struct regnode *regnode, int min_uvolt, int max_uvolt)
+{
+	int udelay;
+	int rv;
+
+	REG_TOPO_ASSERT();
+
+	REGNODE_XLOCK(regnode);
+
+	rv = REGNODE_SET_VOLTAGE(regnode, min_uvolt, max_uvolt, &udelay);
+	if (rv == 0)
+		regnode_delay(udelay);
+	REGNODE_UNLOCK(regnode);
+	return (rv);
+}
+
+/*
+ * Consumer variant of regnode_set_voltage().
+ */
+static int
+regnode_set_voltage_checked(struct regnode *regnode, struct regulator *reg,
+    int min_uvolt, int max_uvolt)
+{
+	int udelay;
+	int all_max_uvolt;
+	int all_min_uvolt;
+	struct regulator *tmp;
+	int rv;
+
+	REG_TOPO_ASSERT();
+
+	REGNODE_XLOCK(regnode);
+	/* Return error if requested range is outside of regulator range. */
+	if ((min_uvolt > regnode->std_param.max_uvolt) ||
+	    (max_uvolt < regnode->std_param.min_uvolt)) {
+		REGNODE_UNLOCK(regnode);
+		return (ERANGE);
+	}
+
+	/* Get actual voltage range for all consumers. */
+	all_min_uvolt = regnode->std_param.min_uvolt;
+	all_max_uvolt = regnode->std_param.max_uvolt;
+	TAILQ_FOREACH(tmp, &regnode->consumers_list, link) {
+		/* Don't take requestor in account. */
+		if (tmp == reg)
+			continue;
+		if (all_min_uvolt < tmp->min_uvolt)
+			all_min_uvolt = tmp->min_uvolt;
+		if (all_max_uvolt > tmp->max_uvolt)
+			all_max_uvolt = tmp->max_uvolt;
+	}
+
+	/* Test if request fits to actual contract. */
+	if ((min_uvolt > all_max_uvolt) ||
+	    (max_uvolt < all_min_uvolt)) {
+		REGNODE_UNLOCK(regnode);
+		return (ERANGE);
+	}
+
+	/* Adjust new range.*/
+	if (min_uvolt < all_min_uvolt)
+		min_uvolt = all_min_uvolt;
+	if (max_uvolt > all_max_uvolt)
+		max_uvolt = all_max_uvolt;
+
+	rv = REGNODE_SET_VOLTAGE(regnode, min_uvolt, max_uvolt, &udelay);
+	regnode_delay(udelay);
+	REGNODE_UNLOCK(regnode);
+	return (rv);
+}
+
+int
+regnode_set_constraint(struct regnode *regnode)
+{
+	int status, rv, uvolt;
+
+	if (regnode->std_param.boot_on != true &&
+	    regnode->std_param.always_on != true)
+		return (0);
+
+	rv = regnode_status(regnode, &status);
+	if (rv != 0) {
+		if (bootverbose)
+			printf("Cannot get regulator status for %s\n",
+			    regnode_get_name(regnode));
+		return (rv);
+	}
+
+	if (status == REGULATOR_STATUS_ENABLED)
+		return (0);
+
+	rv = regnode_get_voltage(regnode, &uvolt);
+	if (rv != 0) {
+		if (bootverbose)
+			printf("Cannot get regulator voltage for %s\n",
+			    regnode_get_name(regnode));
+		return (rv);
+	}
+
+	if (uvolt < regnode->std_param.min_uvolt ||
+	  uvolt > regnode->std_param.max_uvolt) {
+		if (bootverbose)
+			printf("Regulator %s current voltage %d is not in the"
+			    " acceptable range : %d<->%d\n",
+			    regnode_get_name(regnode),
+			    uvolt, regnode->std_param.min_uvolt,
+			    regnode->std_param.max_uvolt);
+		return (ERANGE);
+	}
+
+	rv = regnode_enable(regnode);
+	if (rv != 0) {
+		if (bootverbose)
+			printf("Cannot enable regulator %s\n",
+			    regnode_get_name(regnode));
+		return (rv);
+	}
+
+	return (0);
+}
+
+#ifdef FDT
+phandle_t
+regnode_get_ofw_node(struct regnode *regnode)
+{
+
+	return (regnode->ofw_node);
+}
+#endif
+
+/* --------------------------------------------------------------------------
+ *
+ * Regulator consumers interface.
+ *
+ */
+/* Helper function for regulator_get*() */
+static regulator_t
+regulator_create(struct regnode *regnode, device_t cdev)
+{
+	struct regulator *reg;
+
+	REG_TOPO_ASSERT();
+
+	reg =  malloc(sizeof(struct regulator), M_REGULATOR,
+	    M_WAITOK | M_ZERO);
+	reg->cdev = cdev;
+	reg->regnode = regnode;
+	reg->enable_cnt = 0;
+
+	REGNODE_XLOCK(regnode);
+	regnode->ref_cnt++;
+	TAILQ_INSERT_TAIL(&regnode->consumers_list, reg, link);
+	reg ->min_uvolt = regnode->std_param.min_uvolt;
+	reg ->max_uvolt = regnode->std_param.max_uvolt;
+	REGNODE_UNLOCK(regnode);
+
+	return (reg);
+}
+
+int
+regulator_enable(regulator_t reg)
+{
+	int rv;
+	struct regnode *regnode;
+
+	regnode = reg->regnode;
+	KASSERT(regnode->ref_cnt > 0,
+	   ("Attempt to access unreferenced regulator: %s\n", regnode->name));
+	REG_TOPO_SLOCK();
+	rv = regnode_enable(regnode);
+	if (rv == 0)
+		reg->enable_cnt++;
+	REG_TOPO_UNLOCK();
+	return (rv);
+}
+
+int
+regulator_disable(regulator_t reg)
+{
+	int rv;
+	struct regnode *regnode;
+
+	regnode = reg->regnode;
+	KASSERT(regnode->ref_cnt > 0,
+	   ("Attempt to access unreferenced regulator: %s\n", regnode->name));
+	KASSERT(reg->enable_cnt > 0,
+	   ("Attempt to disable already disabled regulator: %s\n",
+	   regnode->name));
+	REG_TOPO_SLOCK();
+	rv = regnode_disable(regnode);
+	if (rv == 0)
+		reg->enable_cnt--;
+	REG_TOPO_UNLOCK();
+	return (rv);
+}
+
+int
+regulator_stop(regulator_t reg)
+{
+	int rv;
+	struct regnode *regnode;
+
+	regnode = reg->regnode;
+	KASSERT(regnode->ref_cnt > 0,
+	   ("Attempt to access unreferenced regulator: %s\n", regnode->name));
+	KASSERT(reg->enable_cnt == 0,
+	   ("Attempt to stop already enabled regulator: %s\n", regnode->name));
+
+	REG_TOPO_SLOCK();
+	rv = regnode_stop(regnode, 0);
+	REG_TOPO_UNLOCK();
+	return (rv);
+}
+
+int
+regulator_status(regulator_t reg, int *status)
+{
+	int rv;
+	struct regnode *regnode;
+
+	regnode = reg->regnode;
+	KASSERT(regnode->ref_cnt > 0,
+	   ("Attempt to access unreferenced regulator: %s\n", regnode->name));
+
+	REG_TOPO_SLOCK();
+	rv = regnode_status(regnode, status);
+	REG_TOPO_UNLOCK();
+	return (rv);
+}
+
+int
+regulator_get_voltage(regulator_t reg, int *uvolt)
+{
+	int rv;
+	struct regnode *regnode;
+
+	regnode = reg->regnode;
+	KASSERT(regnode->ref_cnt > 0,
+	   ("Attempt to access unreferenced regulator: %s\n", regnode->name));
+
+	REG_TOPO_SLOCK();
+	rv = regnode_get_voltage(regnode, uvolt);
+	REG_TOPO_UNLOCK();
+	return (rv);
+}
+
+int
+regulator_set_voltage(regulator_t reg, int min_uvolt, int max_uvolt)
+{
+	struct regnode *regnode;
+	int rv;
+
+	regnode = reg->regnode;
+	KASSERT(regnode->ref_cnt > 0,
+	   ("Attempt to access unreferenced regulator: %s\n", regnode->name));
+
+	REG_TOPO_SLOCK();
+
+	rv = regnode_set_voltage_checked(regnode, reg, min_uvolt, max_uvolt);
+	if (rv == 0) {
+		reg->min_uvolt = min_uvolt;
+		reg->max_uvolt = max_uvolt;
+	}
+	REG_TOPO_UNLOCK();
+	return (rv);
+}
+
+int
+regulator_check_voltage(regulator_t reg, int uvolt)
+{
+	int rv;
+	struct regnode *regnode;
+
+	regnode = reg->regnode;
+	KASSERT(regnode->ref_cnt > 0,
+	   ("Attempt to access unreferenced regulator: %s\n", regnode->name));
+
+	REG_TOPO_SLOCK();
+	rv = REGNODE_CHECK_VOLTAGE(regnode, uvolt);
+	REG_TOPO_UNLOCK();
+	return (rv);
+}
+
+const char *
+regulator_get_name(regulator_t reg)
+{
+	struct regnode *regnode;
+
+	regnode = reg->regnode;
+	KASSERT(regnode->ref_cnt > 0,
+	   ("Attempt to access unreferenced regulator: %s\n", regnode->name));
+	return (regnode->name);
+}
+
+int
+regulator_get_by_name(device_t cdev, const char *name, regulator_t *reg)
+{
+	struct regnode *regnode;
+
+	REG_TOPO_SLOCK();
+	regnode = regnode_find_by_name(name);
+	if (regnode == NULL) {
+		REG_TOPO_UNLOCK();
+		return (ENODEV);
+	}
+	*reg = regulator_create(regnode, cdev);
+	REG_TOPO_UNLOCK();
+	return (0);
+}
+
+int
+regulator_get_by_id(device_t cdev, device_t pdev, intptr_t id, regulator_t *reg)
+{
+	struct regnode *regnode;
+
+	REG_TOPO_SLOCK();
+
+	regnode = regnode_find_by_id(pdev, id);
+	if (regnode == NULL) {
+		REG_TOPO_UNLOCK();
+		return (ENODEV);
+	}
+	*reg = regulator_create(regnode, cdev);
+	REG_TOPO_UNLOCK();
+
+	return (0);
+}
+
+int
+regulator_release(regulator_t reg)
+{
+	struct regnode *regnode;
+
+	regnode = reg->regnode;
+	KASSERT(regnode->ref_cnt > 0,
+	   ("Attempt to access unreferenced regulator: %s\n", regnode->name));
+	REG_TOPO_SLOCK();
+	while (reg->enable_cnt > 0) {
+		regnode_disable(regnode);
+		reg->enable_cnt--;
+	}
+	REGNODE_XLOCK(regnode);
+	TAILQ_REMOVE(&regnode->consumers_list, reg, link);
+	regnode->ref_cnt--;
+	REGNODE_UNLOCK(regnode);
+	REG_TOPO_UNLOCK();
+
+	free(reg, M_REGULATOR);
+	return (0);
+}
+
+#ifdef FDT
+/* Default DT mapper. */
+int
+regdev_default_ofw_map(device_t dev, phandle_t 	xref, int ncells,
+    pcell_t *cells, intptr_t *id)
+{
+	if (ncells == 0)
+		*id = 1;
+	else if (ncells == 1)
+		*id = cells[0];
+	else
+		return  (ERANGE);
+
+	return (0);
+}
+
+int
+regulator_parse_ofw_stdparam(device_t pdev, phandle_t node,
+    struct regnode_init_def *def)
+{
+	phandle_t supply_xref;
+	struct regnode_std_param *par;
+	int rv;
+
+	par = &def->std_param;
+	rv = OF_getprop_alloc(node, "regulator-name",
+	    (void **)&def->name);
+	if (rv <= 0) {
+		device_printf(pdev, "%s: Missing regulator name\n",
+		 __func__);
+		return (ENXIO);
+	}
+
+	rv = OF_getencprop(node, "regulator-min-microvolt", &par->min_uvolt,
+	    sizeof(par->min_uvolt));
+	if (rv <= 0)
+		par->min_uvolt = 0;
+
+	rv = OF_getencprop(node, "regulator-max-microvolt", &par->max_uvolt,
+	    sizeof(par->max_uvolt));
+	if (rv <= 0)
+		par->max_uvolt = 0;
+
+	rv = OF_getencprop(node, "regulator-min-microamp", &par->min_uamp,
+	    sizeof(par->min_uamp));
+	if (rv <= 0)
+		par->min_uamp = 0;
+
+	rv = OF_getencprop(node, "regulator-max-microamp", &par->max_uamp,
+	    sizeof(par->max_uamp));
+	if (rv <= 0)
+		par->max_uamp = 0;
+
+	rv = OF_getencprop(node, "regulator-ramp-delay", &par->ramp_delay,
+	    sizeof(par->ramp_delay));
+	if (rv <= 0)
+		par->ramp_delay = 0;
+
+	rv = OF_getencprop(node, "regulator-enable-ramp-delay",
+	    &par->enable_delay, sizeof(par->enable_delay));
+	if (rv <= 0)
+		par->enable_delay = 0;
+
+	if (OF_hasprop(node, "regulator-boot-on"))
+		par->boot_on = true;
+
+	if (OF_hasprop(node, "regulator-always-on"))
+		par->always_on = true;
+
+	if (OF_hasprop(node, "enable-active-high"))
+		par->enable_active_high = 1;
+
+	rv = OF_getencprop(node, "vin-supply", &supply_xref,
+	    sizeof(supply_xref));
+	if (rv >=  0) {
+		rv = OF_getprop_alloc(supply_xref, "regulator-name",
+		    (void **)&def->parent_name);
+		if (rv <= 0)
+			def->parent_name = NULL;
+	}
+	return (0);
+}
+
+int
+regulator_get_by_ofw_property(device_t cdev, phandle_t cnode, char *name,
+    regulator_t *reg)
+{
+	phandle_t *cells;
+	device_t regdev;
+	int ncells, rv;
+	intptr_t id;
+
+	*reg = NULL;
+
+	if (cnode <= 0)
+		cnode = ofw_bus_get_node(cdev);
+	if (cnode <= 0) {
+		device_printf(cdev, "%s called on not ofw based device\n",
+		 __func__);
+		return (ENXIO);
+	}
+
+	cells = NULL;
+	ncells = OF_getencprop_alloc_multi(cnode, name, sizeof(*cells),
+	    (void **)&cells);
+	if (ncells <= 0)
+		return (ENOENT);
+
+	/* Translate xref to device */
+	regdev = OF_device_from_xref(cells[0]);
+	if (regdev == NULL) {
+		OF_prop_free(cells);
+		return (ENODEV);
+	}
+
+	/* Map regulator to number */
+	rv = REGDEV_MAP(regdev, cells[0], ncells - 1, cells + 1, &id);
+	OF_prop_free(cells);
+	if (rv != 0)
+		return (rv);
+	return (regulator_get_by_id(cdev, regdev, id, reg));
+}
+#endif
+
+/* --------------------------------------------------------------------------
+ *
+ * Regulator utility functions.
+ *
+ */
+
+/* Convert raw selector value to real voltage */
+int
+regulator_range_sel8_to_volt(struct regulator_range *ranges, int nranges,
+   uint8_t sel, int *volt)
+{
+	struct regulator_range *range;
+	int i;
+
+	if (nranges == 0)
+		panic("Voltage regulator have zero ranges\n");
+
+	for (i = 0; i < nranges ; i++) {
+		range = ranges  + i;
+
+		if (!(sel >= range->min_sel &&
+		      sel <= range->max_sel))
+			continue;
+
+		sel -= range->min_sel;
+
+		*volt = range->min_uvolt + sel * range->step_uvolt;
+		return (0);
+	}
+
+	return (ERANGE);
+}
+
+int
+regulator_range_volt_to_sel8(struct regulator_range *ranges, int nranges,
+    int min_uvolt, int max_uvolt, uint8_t *out_sel)
+{
+	struct regulator_range *range;
+	uint8_t sel;
+	int uvolt;
+	int rv, i;
+
+	if (nranges == 0)
+		panic("Voltage regulator have zero ranges\n");
+
+	for (i = 0; i < nranges; i++) {
+		range = ranges  + i;
+		uvolt = range->min_uvolt +
+		    (range->max_sel - range->min_sel) * range->step_uvolt;
+
+		if ((min_uvolt > uvolt) ||
+		    (max_uvolt < range->min_uvolt))
+			continue;
+
+		if (min_uvolt <= range->min_uvolt)
+			min_uvolt = range->min_uvolt;
+
+		/* if step == 0 -> fixed voltage range. */
+		if (range->step_uvolt == 0)
+			sel = 0;
+		else
+			sel = DIV_ROUND_UP(min_uvolt - range->min_uvolt,
+			   range->step_uvolt);
+
+
+		sel += range->min_sel;
+
+		break;
+	}
+
+	if (i >= nranges)
+		return (ERANGE);
+
+	/* Verify new settings. */
+	rv = regulator_range_sel8_to_volt(ranges, nranges, sel, &uvolt);
+	if (rv != 0)
+		return (rv);
+	if ((uvolt < min_uvolt) || (uvolt > max_uvolt))
+		return (ERANGE);
+
+	*out_sel = sel;
+	return (0);
+}
diff --git a/freebsd/sys/dev/extres/regulator/regulator.h b/freebsd/sys/dev/extres/regulator/regulator.h
new file mode 100644
index 0000000..3905aa3
--- /dev/null
+++ b/freebsd/sys/dev/extres/regulator/regulator.h
@@ -0,0 +1,156 @@
+/*-
+ * Copyright 2016 Michal Meloun <mmel at FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _DEV_EXTRES_REGULATOR_H_
+#define _DEV_EXTRES_REGULATOR_H_
+#include <rtems/bsd/local/opt_platform.h>
+
+#include <sys/kobj.h>
+#include <sys/sysctl.h>
+#ifdef FDT
+#include <dev/ofw/ofw_bus.h>
+#endif
+#include <rtems/bsd/local/regnode_if.h>
+
+SYSCTL_DECL(_hw_regulator);
+
+#define REGULATOR_FLAGS_STATIC		0x00000001  /* Static strings */
+#define REGULATOR_FLAGS_NOT_DISABLE	0x00000002  /* Cannot be disabled */
+
+#define REGULATOR_STATUS_ENABLED	0x00000001
+#define REGULATOR_STATUS_OVERCURRENT	0x00000002
+
+typedef struct regulator *regulator_t;
+
+/* Standard regulator parameters. */
+struct regnode_std_param {
+	int 			min_uvolt;	/* In uV */
+	int 			max_uvolt;	/* In uV */
+	int 			min_uamp;	/* In uA */
+	int 			max_uamp;	/* In uA */
+	int 			ramp_delay;	/* In uV/usec */
+	int 			enable_delay;	/* In usec */
+	bool 			boot_on;	/* Is enabled on boot */
+	bool 			always_on;	/* Must be enabled */
+	int			enable_active_high;
+};
+
+/* Initialization parameters. */
+struct regnode_init_def {
+	char			*name;		/* Regulator name */
+	char			*parent_name;	/* Name of parent regulator */
+	struct regnode_std_param std_param;	/* Standard parameters */
+	intptr_t		id;		/* Regulator ID */
+	int			flags;		/* Flags */
+#ifdef FDT
+	 phandle_t 		ofw_node;	/* OFW node of regulator */
+#endif
+};
+
+struct regulator_range {
+	int		min_uvolt;
+	int		step_uvolt;
+	uint8_t		min_sel;
+	uint8_t		max_sel;
+};
+
+#define	REG_RANGE_INIT(_min_sel, _max_sel, _min_uvolt, _step_uvolt) {	\
+	.min_sel	= _min_sel,					\
+	.max_sel	= _max_sel,					\
+	.min_uvolt	= _min_uvolt,					\
+	.step_uvolt	= _step_uvolt,					\
+}
+
+/*
+ * Shorthands for constructing method tables.
+ */
+#define	REGNODEMETHOD		KOBJMETHOD
+#define	REGNODEMETHOD_END	KOBJMETHOD_END
+#define regnode_method_t	kobj_method_t
+#define regnode_class_t		kobj_class_t
+DECLARE_CLASS(regnode_class);
+
+/* Providers interface. */
+struct regnode *regnode_create(device_t pdev, regnode_class_t regnode_class,
+    struct regnode_init_def *def);
+struct regnode *regnode_register(struct regnode *regnode);
+const char *regnode_get_name(struct regnode *regnode);
+const char *regnode_get_parent_name(struct regnode *regnode);
+struct regnode *regnode_get_parent(struct regnode *regnode);
+int regnode_get_flags(struct regnode *regnode);
+void *regnode_get_softc(struct regnode *regnode);
+device_t regnode_get_device(struct regnode *regnode);
+struct regnode_std_param *regnode_get_stdparam(struct regnode *regnode);
+void regnode_topo_unlock(void);
+void regnode_topo_xlock(void);
+void regnode_topo_slock(void);
+
+int regnode_enable(struct regnode *regnode);
+int regnode_disable(struct regnode *regnode);
+int regnode_stop(struct regnode *regnode, int depth);
+int regnode_status(struct regnode *regnode, int *status);
+int regnode_get_voltage(struct regnode *regnode, int *uvolt);
+int regnode_set_voltage(struct regnode *regnode, int min_uvolt, int max_uvolt);
+int regnode_set_constraint(struct regnode *regnode);
+
+/* Standard method that aren't default */
+int regnode_method_check_voltage(struct regnode *regnode, int uvolt);
+
+#ifdef FDT
+phandle_t regnode_get_ofw_node(struct regnode *regnode);
+#endif
+
+/* Consumers interface. */
+int regulator_get_by_name(device_t cdev, const char *name,
+     regulator_t *regulator);
+int regulator_get_by_id(device_t cdev, device_t pdev, intptr_t id,
+    regulator_t *regulator);
+int regulator_release(regulator_t regulator);
+const char *regulator_get_name(regulator_t regulator);
+int regulator_enable(regulator_t reg);
+int regulator_disable(regulator_t reg);
+int regulator_stop(regulator_t reg);
+int regulator_status(regulator_t reg, int *status);
+int regulator_get_voltage(regulator_t reg, int *uvolt);
+int regulator_set_voltage(regulator_t reg, int min_uvolt, int max_uvolt);
+int regulator_check_voltage(regulator_t reg, int uvolt);
+
+#ifdef FDT
+int regulator_get_by_ofw_property(device_t dev, phandle_t node, char *name,
+    regulator_t *reg);
+int regulator_parse_ofw_stdparam(device_t dev, phandle_t node,
+    struct regnode_init_def *def);
+#endif
+
+/* Utility functions */
+int regulator_range_volt_to_sel8(struct regulator_range *ranges, int nranges,
+    int min_uvolt, int max_uvolt, uint8_t *out_sel);
+int regulator_range_sel8_to_volt(struct regulator_range *ranges, int nranges,
+   uint8_t sel, int *volt);
+
+#endif /* _DEV_EXTRES_REGULATOR_H_ */
diff --git a/freebsd/sys/dev/extres/regulator/regulator_bus.c b/freebsd/sys/dev/extres/regulator/regulator_bus.c
new file mode 100644
index 0000000..b79c263
--- /dev/null
+++ b/freebsd/sys/dev/extres/regulator/regulator_bus.c
@@ -0,0 +1,89 @@
+#include <machine/rtems-bsd-kernel-space.h>
+
+/*-
+ * Copyright 2016 Michal Meloun <mmel at FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/bus.h>
+
+#include <dev/fdt/simplebus.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+struct ofw_regulator_bus_softc {
+	struct simplebus_softc simplebus_sc;
+};
+
+static int
+ofw_regulator_bus_probe(device_t dev)
+{
+	const char	*name;
+
+	name = ofw_bus_get_name(dev);
+	if (name == NULL || strcmp(name, "regulators") != 0)
+		return (ENXIO);
+	device_set_desc(dev, "OFW regulators bus");
+
+	return (0);
+}
+
+static int
+ofw_regulator_bus_attach(device_t dev)
+{
+	phandle_t node, child;
+
+	node  = ofw_bus_get_node(dev);
+	simplebus_init(dev, node);
+
+	for (child = OF_child(node); child > 0; child = OF_peer(child)) {
+		simplebus_add_device(dev, child, 0, NULL, -1, NULL);
+	}
+
+	return (bus_generic_attach(dev));
+}
+
+static device_method_t ofw_regulator_bus_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		ofw_regulator_bus_probe),
+	DEVMETHOD(device_attach,	ofw_regulator_bus_attach),
+
+	DEVMETHOD_END
+};
+
+DEFINE_CLASS_1(ofw_regulator_bus, ofw_regulator_bus_driver,
+    ofw_regulator_bus_methods, sizeof(struct ofw_regulator_bus_softc),
+    simplebus_driver);
+static devclass_t ofw_regulator_bus_devclass;
+EARLY_DRIVER_MODULE(ofw_regulator_bus, simplebus, ofw_regulator_bus_driver,
+    ofw_regulator_bus_devclass, 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
+MODULE_VERSION(ofw_regulator_bus, 1);
diff --git a/freebsd/sys/dev/extres/regulator/regulator_fixed.c b/freebsd/sys/dev/extres/regulator/regulator_fixed.c
new file mode 100644
index 0000000..0bc6d96
--- /dev/null
+++ b/freebsd/sys/dev/extres/regulator/regulator_fixed.c
@@ -0,0 +1,502 @@
+#include <machine/rtems-bsd-kernel-space.h>
+
+/*-
+ * Copyright 2016 Michal Meloun <mmel at FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <rtems/bsd/local/opt_platform.h>
+#include <sys/param.h>
+#include <sys/conf.h>
+#include <sys/gpio.h>
+#include <sys/kernel.h>
+#include <sys/kobj.h>
+#include <sys/systm.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+
+#ifdef FDT
+#include <dev/fdt/fdt_common.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+#endif
+#include <dev/gpio/gpiobusvar.h>
+#include <dev/extres/regulator/regulator_fixed.h>
+
+#include <rtems/bsd/local/regdev_if.h>
+
+MALLOC_DEFINE(M_FIXEDREGULATOR, "fixedregulator", "Fixed regulator");
+
+/* GPIO list for shared pins. */
+typedef TAILQ_HEAD(gpio_list, gpio_entry) gpio_list_t;
+struct gpio_entry {
+	TAILQ_ENTRY(gpio_entry)	link;
+	struct gpiobus_pin	gpio_pin;
+	int 			use_cnt;
+	int 			enable_cnt;
+	bool			always_on;
+};
+static gpio_list_t gpio_list = TAILQ_HEAD_INITIALIZER(gpio_list);
+static struct mtx gpio_list_mtx;
+MTX_SYSINIT(gpio_list_lock, &gpio_list_mtx, "Regulator GPIO lock", MTX_DEF);
+
+struct regnode_fixed_sc {
+	struct regnode_std_param *param;
+	bool			gpio_open_drain;
+	struct gpio_entry	*gpio_entry;
+};
+
+static int regnode_fixed_init(struct regnode *regnode);
+static int regnode_fixed_enable(struct regnode *regnode, bool enable,
+    int *udelay);
+static int regnode_fixed_status(struct regnode *regnode, int *status);
+static int regnode_fixed_stop(struct regnode *regnode, int *udelay);
+
+static regnode_method_t regnode_fixed_methods[] = {
+	/* Regulator interface */
+	REGNODEMETHOD(regnode_init,		regnode_fixed_init),
+	REGNODEMETHOD(regnode_enable,		regnode_fixed_enable),
+	REGNODEMETHOD(regnode_status,		regnode_fixed_status),
+	REGNODEMETHOD(regnode_stop,		regnode_fixed_stop),
+	REGNODEMETHOD(regnode_check_voltage,	regnode_method_check_voltage),
+	REGNODEMETHOD_END
+};
+DEFINE_CLASS_1(regnode_fixed, regnode_fixed_class, regnode_fixed_methods,
+   sizeof(struct regnode_fixed_sc), regnode_class);
+
+/*
+ * GPIO list functions.
+ * Two or more regulators can share single GPIO pins, so we must track all
+ * GPIOs in gpio_list.
+ * The GPIO pin is registerd and reseved for first consumer, all others share
+ * gpio_entry with it.
+ */
+static struct gpio_entry *
+regnode_get_gpio_entry(struct gpiobus_pin *gpio_pin)
+{
+	struct gpio_entry *entry, *tmp;
+	device_t busdev;
+	int rv;
+
+	busdev = GPIO_GET_BUS(gpio_pin->dev);
+	if (busdev == NULL)
+		return (NULL);
+	entry = malloc(sizeof(struct gpio_entry), M_FIXEDREGULATOR,
+	    M_WAITOK | M_ZERO);
+
+	mtx_lock(&gpio_list_mtx);
+
+	TAILQ_FOREACH(tmp, &gpio_list, link) {
+		if (tmp->gpio_pin.dev == gpio_pin->dev &&
+		    tmp->gpio_pin.pin == gpio_pin->pin) {
+			tmp->use_cnt++;
+			mtx_unlock(&gpio_list_mtx);
+			free(entry, M_FIXEDREGULATOR);
+			return (tmp);
+		}
+	}
+
+	/* Reserve pin. */
+	/* XXX Can we call gpiobus_acquire_pin() with gpio_list_mtx held? */
+	rv = gpiobus_acquire_pin(busdev, gpio_pin->pin);
+	if (rv != 0) {
+		mtx_unlock(&gpio_list_mtx);
+		free(entry, M_FIXEDREGULATOR);
+		return (NULL);
+	}
+	/* Everything is OK, build new entry and insert it to list. */
+	entry->gpio_pin = *gpio_pin;
+	entry->use_cnt = 1;
+	TAILQ_INSERT_TAIL(&gpio_list, entry, link);
+
+	mtx_unlock(&gpio_list_mtx);
+	return (entry);
+}
+
+
+/*
+ * Regulator class implementation.
+ */
+static int
+regnode_fixed_init(struct regnode *regnode)
+{
+	device_t dev;
+	struct regnode_fixed_sc *sc;
+	struct gpiobus_pin *pin;
+	uint32_t flags;
+	int rv;
+
+	sc = regnode_get_softc(regnode);
+	dev = regnode_get_device(regnode);
+	sc->param = regnode_get_stdparam(regnode);
+	if (sc->gpio_entry == NULL)
+		return (0);
+	pin = &sc->gpio_entry->gpio_pin;
+
+	flags = GPIO_PIN_OUTPUT;
+	if (sc->gpio_open_drain)
+		flags |= GPIO_PIN_OPENDRAIN;
+	if (sc->param->boot_on || sc->param->always_on) {
+		rv = GPIO_PIN_SET(pin->dev, pin->pin, sc->param->enable_active_high);
+		if (rv != 0) {
+			device_printf(dev, "Cannot set GPIO pin: %d\n",
+			    pin->pin);
+			return (rv);
+		}
+	}
+
+	rv = GPIO_PIN_SETFLAGS(pin->dev, pin->pin, flags);
+	if (rv != 0) {
+		device_printf(dev, "Cannot configure GPIO pin: %d\n", pin->pin);
+		return (rv);
+	}
+
+	return (0);
+}
+
+/*
+ * Enable/disable regulator.
+ * Take shared GPIO pins in account
+ */
+static int
+regnode_fixed_enable(struct regnode *regnode, bool enable, int *udelay)
+{
+	device_t dev;
+	struct regnode_fixed_sc *sc;
+	struct gpiobus_pin *pin;
+	int rv;
+
+	sc = regnode_get_softc(regnode);
+	dev = regnode_get_device(regnode);
+
+	*udelay = 0;
+	if (sc->gpio_entry == NULL)
+		return (0);
+	pin = &sc->gpio_entry->gpio_pin;
+	if (enable) {
+		sc->gpio_entry->enable_cnt++;
+		if (sc->gpio_entry->enable_cnt > 1)
+			return (0);
+	} else {
+		KASSERT(sc->gpio_entry->enable_cnt > 0,
+		    ("Invalid enable count"));
+		sc->gpio_entry->enable_cnt--;
+		if (sc->gpio_entry->enable_cnt >= 1)
+			return (0);
+	}
+	if (sc->gpio_entry->always_on && !enable)
+		return (0);
+	if (!sc->param->enable_active_high)
+		enable = !enable;
+	rv = GPIO_PIN_SET(pin->dev, pin->pin, enable);
+	if (rv != 0) {
+		device_printf(dev, "Cannot set GPIO pin: %d\n", pin->pin);
+		return (rv);
+	}
+	*udelay = sc->param->enable_delay;
+	return (0);
+}
+
+/*
+ * Stop (physicaly shutdown) regulator.
+ * Take shared GPIO pins in account
+ */
+static int
+regnode_fixed_stop(struct regnode *regnode, int *udelay)
+{
+	device_t dev;
+	struct regnode_fixed_sc *sc;
+	struct gpiobus_pin *pin;
+	int rv;
+
+	sc = regnode_get_softc(regnode);
+	dev = regnode_get_device(regnode);
+
+	*udelay = 0;
+	if (sc->gpio_entry == NULL)
+		return (0);
+	if (sc->gpio_entry->always_on)
+		return (0);
+	pin = &sc->gpio_entry->gpio_pin;
+	if (sc->gpio_entry->enable_cnt > 0) {
+		/* Other regulator(s) are enabled. */
+		/* XXXX Any diagnostic message? Or error? */
+		return (0);
+	}
+	rv = GPIO_PIN_SET(pin->dev, pin->pin,
+	    sc->param->enable_active_high ? false: true);
+	if (rv != 0) {
+		device_printf(dev, "Cannot set GPIO pin: %d\n", pin->pin);
+		return (rv);
+	}
+	*udelay = sc->param->enable_delay;
+	return (0);
+}
+
+static int
+regnode_fixed_status(struct regnode *regnode, int *status)
+{
+	struct regnode_fixed_sc *sc;
+	struct gpiobus_pin *pin;
+	uint32_t val;
+	int rv;
+
+	sc = regnode_get_softc(regnode);
+
+	*status = 0;
+	if (sc->gpio_entry == NULL) {
+		*status = REGULATOR_STATUS_ENABLED;
+		return (0);
+	}
+	pin = &sc->gpio_entry->gpio_pin;
+
+	rv = GPIO_PIN_GET(pin->dev, pin->pin, &val);
+	if (rv == 0) {
+		if (!sc->param->enable_active_high ^ (val != 0))
+			*status = REGULATOR_STATUS_ENABLED;
+	}
+	return (rv);
+}
+
+int
+regnode_fixed_register(device_t dev, struct regnode_fixed_init_def *init_def)
+{
+	struct regnode *regnode;
+	struct regnode_fixed_sc *sc;
+
+	regnode = regnode_create(dev, &regnode_fixed_class,
+	    &init_def->reg_init_def);
+	if (regnode == NULL) {
+		device_printf(dev, "Cannot create regulator.\n");
+		return(ENXIO);
+	}
+	sc = regnode_get_softc(regnode);
+	sc->gpio_open_drain = init_def->gpio_open_drain;
+	if (init_def->gpio_pin != NULL) {
+		sc->gpio_entry = regnode_get_gpio_entry(init_def->gpio_pin);
+		if (sc->gpio_entry == NULL)
+			return(ENXIO);
+	}
+	regnode = regnode_register(regnode);
+	if (regnode == NULL) {
+		device_printf(dev, "Cannot register regulator.\n");
+		return(ENXIO);
+	}
+
+	if (sc->gpio_entry != NULL)
+		sc->gpio_entry->always_on |= sc->param->always_on;
+
+	return (0);
+}
+
+/*
+ * OFW Driver implementation.
+ */
+#ifdef FDT
+
+struct  regfix_softc
+{
+	device_t			dev;
+	bool				attach_done;
+	struct regnode_fixed_init_def	init_def;
+	phandle_t			gpio_prodxref;
+	pcell_t				*gpio_cells;
+	int				gpio_ncells;
+	struct gpiobus_pin		gpio_pin;
+};
+
+static struct ofw_compat_data compat_data[] = {
+	{"regulator-fixed",		1},
+	{NULL,				0},
+};
+
+static int
+regfix_get_gpio(struct regfix_softc * sc)
+{
+	device_t busdev;
+	phandle_t node;
+
+	int rv;
+
+	if (sc->gpio_prodxref == 0)
+		return (0);
+
+	node = ofw_bus_get_node(sc->dev);
+
+	/* Test if controller exist. */
+	sc->gpio_pin.dev = OF_device_from_xref(sc->gpio_prodxref);
+	if (sc->gpio_pin.dev == NULL)
+		return (ENODEV);
+
+	/* Test if GPIO bus already exist. */
+	busdev = GPIO_GET_BUS(sc->gpio_pin.dev);
+	if (busdev == NULL)
+		return (ENODEV);
+
+	rv = gpio_map_gpios(sc->gpio_pin.dev, node,
+	    OF_node_from_xref(sc->gpio_prodxref), sc->gpio_ncells,
+	    sc->gpio_cells, &(sc->gpio_pin.pin), &(sc->gpio_pin.flags));
+	if (rv != 0) {
+		device_printf(sc->dev, "Cannot map the gpio property.\n");
+		return (ENXIO);
+	}
+	sc->init_def.gpio_pin = &sc->gpio_pin;
+	return (0);
+}
+
+static int
+regfix_parse_fdt(struct regfix_softc * sc)
+{
+	phandle_t node;
+	int rv;
+	struct regnode_init_def *init_def;
+
+	node = ofw_bus_get_node(sc->dev);
+	init_def = &sc->init_def.reg_init_def;
+
+	rv = regulator_parse_ofw_stdparam(sc->dev, node, init_def);
+	if (rv != 0) {
+		device_printf(sc->dev, "Cannot parse standard parameters.\n");
+		return(rv);
+	}
+
+	/* Fixed regulator uses 'startup-delay-us' property for enable_delay */
+	rv = OF_getencprop(node, "startup-delay-us",
+	   &init_def->std_param.enable_delay,
+	   sizeof(init_def->std_param.enable_delay));
+	if (rv <= 0)
+		init_def->std_param.enable_delay = 0;
+	/* GPIO pin */
+	if (OF_hasprop(node, "gpio-open-drain"))
+		sc->init_def.gpio_open_drain = true;
+
+	if (!OF_hasprop(node, "gpio"))
+		return (0);
+	rv = ofw_bus_parse_xref_list_alloc(node, "gpio", "#gpio-cells", 0,
+	    &sc->gpio_prodxref, &sc->gpio_ncells, &sc->gpio_cells);
+	if (rv != 0) {
+		sc->gpio_prodxref = 0;
+		device_printf(sc->dev, "Malformed gpio property\n");
+		return (ENXIO);
+	}
+	return (0);
+}
+
+static void
+regfix_new_pass(device_t dev)
+{
+	struct regfix_softc * sc;
+	int rv;
+
+	sc = device_get_softc(dev);
+	bus_generic_new_pass(dev);
+
+	if (sc->attach_done)
+		return;
+
+	/* Try to get and configure GPIO. */
+	rv = regfix_get_gpio(sc);
+	if (rv != 0)
+		return;
+
+	/* Register regulator. */
+	regnode_fixed_register(sc->dev, &sc->init_def);
+	sc->attach_done = true;
+}
+
+static int
+regfix_probe(device_t dev)
+{
+
+	if (!ofw_bus_status_okay(dev))
+		return (ENXIO);
+
+	if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data)
+		return (ENXIO);
+
+	device_set_desc(dev, "Fixed Regulator");
+	return (BUS_PROBE_DEFAULT);
+}
+
+static int
+regfix_detach(device_t dev)
+{
+
+	/* This device is always present. */
+	return (EBUSY);
+}
+
+static int
+regfix_attach(device_t dev)
+{
+	struct regfix_softc * sc;
+	int rv;
+
+	sc = device_get_softc(dev);
+	sc->dev = dev;
+
+	/* Parse FDT data. */
+	rv = regfix_parse_fdt(sc);
+	if (rv != 0)
+		return(ENXIO);
+
+	/* Fill reset of init. */
+	sc->init_def.reg_init_def.id = 1;
+	sc->init_def.reg_init_def.flags = REGULATOR_FLAGS_STATIC;
+
+	/* Try to get and configure GPIO. */
+	rv = regfix_get_gpio(sc);
+	if (rv != 0)
+		return (bus_generic_attach(dev));
+
+	/* Register regulator. */
+	regnode_fixed_register(sc->dev, &sc->init_def);
+	sc->attach_done = true;
+
+	return (bus_generic_attach(dev));
+}
+
+static device_method_t regfix_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		regfix_probe),
+	DEVMETHOD(device_attach,	regfix_attach),
+	DEVMETHOD(device_detach,	regfix_detach),
+	/* Bus interface */
+	DEVMETHOD(bus_new_pass,		regfix_new_pass),
+	/* Regdev interface */
+	DEVMETHOD(regdev_map,		regdev_default_ofw_map),
+
+	DEVMETHOD_END
+};
+
+static devclass_t regfix_devclass;
+DEFINE_CLASS_0(regfix, regfix_driver, regfix_methods,
+    sizeof(struct regfix_softc));
+EARLY_DRIVER_MODULE(regfix, simplebus, regfix_driver,
+   regfix_devclass, 0, 0, BUS_PASS_BUS);
+
+#endif /* FDT */
diff --git a/freebsd/sys/dev/extres/regulator/regulator_fixed.h b/freebsd/sys/dev/extres/regulator/regulator_fixed.h
new file mode 100644
index 0000000..5cc0751
--- /dev/null
+++ b/freebsd/sys/dev/extres/regulator/regulator_fixed.h
@@ -0,0 +1,44 @@
+/*-
+ * Copyright 2016 Michal Meloun <mmel at FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _DEV_EXTRES_REGULATOR_FIXED_H_
+#define _DEV_EXTRES_REGULATOR_FIXED_H_
+
+#include <dev/gpio/gpiobusvar.h>
+#include <dev/extres/regulator/regulator.h>
+
+struct regnode_fixed_init_def {
+	struct regnode_init_def	reg_init_def;
+	bool			gpio_open_drain;
+	struct gpiobus_pin	*gpio_pin;
+};
+
+int regnode_fixed_register(device_t dev,
+    struct regnode_fixed_init_def *init_def);
+
+#endif /*_DEV_EXTRES_REGULATOR_FIXED_H_*/
diff --git a/freebsd/sys/dev/gpio/gpioregulator.c b/freebsd/sys/dev/gpio/gpioregulator.c
new file mode 100644
index 0000000..6d05e52
--- /dev/null
+++ b/freebsd/sys/dev/gpio/gpioregulator.c
@@ -0,0 +1,350 @@
+#include <machine/rtems-bsd-kernel-space.h>
+
+/*-
+ * Copyright (c) 2016 Jared McNeill <jmcneill at invisible.ca>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * GPIO controlled regulators
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/rman.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/gpio.h>
+
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include <dev/gpio/gpiobusvar.h>
+
+#include <dev/extres/regulator/regulator.h>
+
+#include <rtems/bsd/local/regdev_if.h>
+
+struct gpioregulator_state {
+	int			val;
+	uint32_t		mask;
+};
+
+struct gpioregulator_init_def {
+	struct regnode_init_def		reg_init_def;
+	struct gpiobus_pin		*enable_pin;
+	int				enable_pin_valid;
+	int				startup_delay_us;
+	int				nstates;
+	struct gpioregulator_state	*states;
+	int				npins;
+	struct gpiobus_pin		**pins;
+};
+
+struct gpioregulator_reg_sc {
+	struct regnode			*regnode;
+	device_t			base_dev;
+	struct regnode_std_param	*param;
+	struct gpioregulator_init_def	*def;
+};
+
+struct gpioregulator_softc {
+	device_t			dev;
+	struct gpioregulator_reg_sc	*reg_sc;
+	struct gpioregulator_init_def	init_def;
+};
+
+static int
+gpioregulator_regnode_init(struct regnode *regnode)
+{
+	struct gpioregulator_reg_sc *sc;
+	int error, n;
+
+	sc = regnode_get_softc(regnode);
+
+	if (sc->def->enable_pin_valid == 1) {
+		error = gpio_pin_setflags(sc->def->enable_pin, GPIO_PIN_OUTPUT);
+		if (error != 0)
+			return (error);
+	}
+
+	for (n = 0; n < sc->def->npins; n++) {
+		error = gpio_pin_setflags(sc->def->pins[n], GPIO_PIN_OUTPUT);
+		if (error != 0)
+			return (error);
+	}
+
+	return (0);
+}
+
+static int
+gpioregulator_regnode_enable(struct regnode *regnode, bool enable, int *udelay)
+{
+	struct gpioregulator_reg_sc *sc;
+	bool active;
+	int error;
+
+	sc = regnode_get_softc(regnode);
+
+	if (sc->def->enable_pin_valid == 1) {
+		active = enable;
+		if (!sc->param->enable_active_high)
+			active = !active;
+		error = gpio_pin_set_active(sc->def->enable_pin, active);
+		if (error != 0)
+			return (error);
+	}
+
+	*udelay = sc->def->startup_delay_us;
+
+	return (0);
+}
+
+static int
+gpioregulator_regnode_set_voltage(struct regnode *regnode, int min_uvolt,
+    int max_uvolt, int *udelay)
+{
+	struct gpioregulator_reg_sc *sc;
+	const struct gpioregulator_state *state;
+	int error, n;
+
+	sc = regnode_get_softc(regnode);
+	state = NULL;
+
+	for (n = 0; n < sc->def->nstates; n++) {
+		if (sc->def->states[n].val >= min_uvolt &&
+		    sc->def->states[n].val <= max_uvolt) {
+			state = &sc->def->states[n];
+			break;
+		}
+	}
+	if (state == NULL)
+		return (EINVAL);
+
+	for (n = 0; n < sc->def->npins; n++) {
+		error = gpio_pin_set_active(sc->def->pins[n],
+		    (state->mask >> n) & 1);
+		if (error != 0)
+			return (error);
+	}
+
+	*udelay = sc->def->startup_delay_us;
+
+	return (0);
+}
+
+static int
+gpioregulator_regnode_get_voltage(struct regnode *regnode, int *uvolt)
+{
+	struct gpioregulator_reg_sc *sc;
+	uint32_t mask;
+	int error, n;
+	bool active;
+
+	sc = regnode_get_softc(regnode);
+	mask = 0;
+
+	for (n = 0; n < sc->def->npins; n++) {
+		error = gpio_pin_is_active(sc->def->pins[n], &active);
+		if (error != 0)
+			return (error);
+		mask |= (active << n);
+	}
+
+	for (n = 0; n < sc->def->nstates; n++) {
+		if (sc->def->states[n].mask == mask) {
+			*uvolt = sc->def->states[n].val;
+			return (0);
+		}
+	}
+
+	return (EIO);
+}
+
+static regnode_method_t gpioregulator_regnode_methods[] = {
+	/* Regulator interface */
+	REGNODEMETHOD(regnode_init,	gpioregulator_regnode_init),
+	REGNODEMETHOD(regnode_enable,	gpioregulator_regnode_enable),
+	REGNODEMETHOD(regnode_set_voltage, gpioregulator_regnode_set_voltage),
+	REGNODEMETHOD(regnode_get_voltage, gpioregulator_regnode_get_voltage),
+	REGNODEMETHOD_END
+};
+DEFINE_CLASS_1(gpioregulator_regnode, gpioregulator_regnode_class,
+    gpioregulator_regnode_methods, sizeof(struct gpioregulator_reg_sc),
+    regnode_class);
+
+static int
+gpioregulator_parse_fdt(struct gpioregulator_softc *sc)
+{
+	uint32_t *pstates, mask;
+	phandle_t node;
+	ssize_t len;
+	int error, n;
+
+	node = ofw_bus_get_node(sc->dev);
+	pstates = NULL;
+	mask = 0;
+
+	error = regulator_parse_ofw_stdparam(sc->dev, node,
+	    &sc->init_def.reg_init_def);
+	if (error != 0)
+		return (error);
+
+	/* "states" property (required) */
+	len = OF_getencprop_alloc_multi(node, "states", sizeof(*pstates),
+	    (void **)&pstates);
+	if (len < 2) {
+		device_printf(sc->dev, "invalid 'states' property\n");
+		error = EINVAL;
+		goto done;
+	}
+	sc->init_def.nstates = len / 2;
+	sc->init_def.states = malloc(sc->init_def.nstates *
+	    sizeof(*sc->init_def.states), M_DEVBUF, M_WAITOK);
+	for (n = 0; n < sc->init_def.nstates; n++) {
+		sc->init_def.states[n].val = pstates[n * 2 + 0];
+		sc->init_def.states[n].mask = pstates[n * 2 + 1];
+		mask |= sc->init_def.states[n].mask;
+	}
+
+	/* "startup-delay-us" property (optional) */
+	len = OF_getencprop(node, "startup-delay-us",
+	    &sc->init_def.startup_delay_us,
+	    sizeof(sc->init_def.startup_delay_us));
+	if (len <= 0)
+		sc->init_def.startup_delay_us = 0;
+
+	/* "enable-gpio" property (optional) */
+	error = gpio_pin_get_by_ofw_property(sc->dev, node, "enable-gpio",
+	    &sc->init_def.enable_pin);
+	if (error == 0)
+		sc->init_def.enable_pin_valid = 1;
+
+	/* "gpios" property */
+	sc->init_def.npins = 32 - __builtin_clz(mask);
+	sc->init_def.pins = malloc(sc->init_def.npins *
+	    sizeof(sc->init_def.pins), M_DEVBUF, M_WAITOK);
+	for (n = 0; n < sc->init_def.npins; n++) {
+		error = gpio_pin_get_by_ofw_idx(sc->dev, node, n,
+		    &sc->init_def.pins[n]);
+		if (error != 0) {
+			device_printf(sc->dev, "cannot get pin %d\n", n);
+			goto done;
+		}
+	}
+
+done:
+	if (error != 0) {
+		for (n = 0; n < sc->init_def.npins; n++) {
+			if (sc->init_def.pins[n] != NULL)
+				gpio_pin_release(sc->init_def.pins[n]);
+		}
+
+		free(sc->init_def.states, M_DEVBUF);
+		free(sc->init_def.pins, M_DEVBUF);
+
+	}
+	OF_prop_free(pstates);
+
+	return (error);
+}
+
+static int
+gpioregulator_probe(device_t dev)
+{
+
+	if (!ofw_bus_is_compatible(dev, "regulator-gpio"))
+		return (ENXIO);
+
+	device_set_desc(dev, "GPIO controlled regulator");
+	return (BUS_PROBE_GENERIC);
+}
+
+static int
+gpioregulator_attach(device_t dev)
+{
+	struct gpioregulator_softc *sc;
+	struct regnode *regnode;
+	phandle_t node;
+	int error;
+
+	sc = device_get_softc(dev);
+	sc->dev = dev;
+	node = ofw_bus_get_node(dev);
+
+	error = gpioregulator_parse_fdt(sc);
+	if (error != 0) {
+		device_printf(dev, "cannot parse parameters\n");
+		return (ENXIO);
+	}
+	sc->init_def.reg_init_def.id = 1;
+	sc->init_def.reg_init_def.ofw_node = node;
+
+	regnode = regnode_create(dev, &gpioregulator_regnode_class,
+	    &sc->init_def.reg_init_def);
+	if (regnode == NULL) {
+		device_printf(dev, "cannot create regulator\n");
+		return (ENXIO);
+	}
+
+	sc->reg_sc = regnode_get_softc(regnode);
+	sc->reg_sc->regnode = regnode;
+	sc->reg_sc->base_dev = dev;
+	sc->reg_sc->param = regnode_get_stdparam(regnode);
+	sc->reg_sc->def = &sc->init_def;
+
+	regnode_register(regnode);
+
+	return (0);
+}
+
+
+static device_method_t gpioregulator_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		gpioregulator_probe),
+	DEVMETHOD(device_attach,	gpioregulator_attach),
+
+	/* Regdev interface */
+	DEVMETHOD(regdev_map,		regdev_default_ofw_map),
+
+	DEVMETHOD_END
+};
+
+static driver_t gpioregulator_driver = {
+	"gpioregulator",
+	gpioregulator_methods,
+	sizeof(struct gpioregulator_softc),
+};
+
+static devclass_t gpioregulator_devclass;
+
+EARLY_DRIVER_MODULE(gpioregulator, simplebus, gpioregulator_driver,
+    gpioregulator_devclass, 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LAST);
+MODULE_VERSION(gpioregulator, 1);



More information about the vc mailing list